To make the key as useful as possible to the reader, who 

 is not familiar with botanical terms, a glossary is added, and 

 the following elementary description of the structure of grasses 

 is given. (See also Figs. 1 and 2.) 



Fig. 1. — B. Festuca elatior. Spikelet with two lower florets opened out. 

 a Lower glume. b Upper glume. c Valve, d Pale. B. Festuca elatior. 

 Floret with Valve removed, a Pale, b Lodicules. c Stamen, d Ovary with 

 two feathery styles. C. Eragrostis superba. Spikelet. a Lower glume, b Upper 

 glume, c Valve. Numerous florets in the spikelet far exsertsd from the 

 glumes. D. Achneria capensis. Spikelet. a Lower glume, b Upper glume, c 

 Valve of lower floret, d Pale of lower floret, e Valve of upper floret. / Pale of 

 upper floret. Two florets enclosed in the glumes. E. Axonopus semialatvs var. 

 ecklonii. Spikelet. a Lower glume, b Upper glume, c Valve of male floret, 

 d Valve of the perfect floret, e Pale. Only one perfect floret, with one male 

 floret below it. F. Aristida bipartita. Spikelet. a Lower glume, b Upper glume. 

 c Valve with 3 branched awn. Only a single floret in the spikelet. G. 

 Andropogon pertusus. a Sessile florvt with lower glume pitted. Awned. 

 b Pedicelled floret usually male. Awnless. (Figs A. and B. after Strasburger). 



